# for i in range(1,10,1):
#     print(i)

# for i in range(1,10):
#     print(i)
#
# for i in range(1,10,2):
#     print(i)

for i in range(10):
    print(i)

# 1. 如果不写开始，默认从0开始
# 2. 如果不写步长，默认为1
